iphone copying folder from bundle to documents

I'm having the hardest time getting this to work. I'm trying to copy a folder from my bundle to the documents directory.

the folder I'm trying to find is here:

...app/Resources/12/(a bunch of jpgs)

NSString *myPath = [[[NSBundle mainBundle] resourcePath]stringByAppendingPathComponent:@"12"];
NSLog(@"%@",myPath);/// returns "..../MyApp.app/12"

NSArray *arrayOf12s = [[NSFileManager defaultManager]contentsOfDirectoryAtPath:myPath error:nil];

NSLog(@"%@",array开发者_如何学COf12s);     ////always returns NULL

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How about using the NSError argument in -contentsOfDirectoryAtPath:error: call?

NSString *myPath = [[[NSBundle mainBundle] resourcePath]stringByAppendingPathComponent:@"12"];
NSLog(@"%@",myPath);/// returns "..../MyApp/12"

NSError *error = nil;
NSArray *arrayOf12s = [[NSFileManager defaultManager]contentsOfDirectoryAtPath:resourceDBFolderPath error:&error];

if (error)
   NSLog(@"Error: %@", [error localizedDescription]);

NSLog(@"%@",arrayOf12s);     ////always returns NULL

It might shine some light on the cause...